The “1% level” column gives the 1% thresholds to be used in the application of the Ramsar Convention Criterion 6. For virtually all estimates given as a single figure or numerical range, the 1% threshold is equal to 1% of the estimate or 1% of the mid-point of the range. 1% thresholds have been rounded according to the following standard:

1% thresholds between 1 and 10 : rounded to nearest 1
1% thresholds between 11 and 100 : rounded to nearest 5
1% thresholds between 101 and 1,000 : rounded to nearest 10
1% thresholds over 1,000 : rounded to nearest 100

In a very few cases, the 1% threshold presented in the tables differs from the calculated value, reflecting an expert judgement that the most recent population estimate may no longer be valid. In all such cases, the discrepancy is explained in the Notes column. For all populations of 2,000,000 or more individuals, the 1% threshold is set at 20,000, as all sites which regularly hold 20,000 or more waterbirds of any species qualify as wetlands of international importance under Ramsar Criterion 5. Besides the Ramsar Convention, the 1% level is also applied for identification of sites of international importance for waterbirds by the East Asian - Australasian Flyway (EAAF) Site Network established under the EAAF Partnership, Central/West Asian Site Network established under CMS, for shorebirds under the Western Hemisphere Shorebird Reserve Network (WHSRN) under the European Union’s Birds Directive and the EMERALD Network under the Convention on the Conservation of European Flora and Fauna.